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G A. YANOCHOWSKI AND H. E. HERSHEY.

SEW-AUTOMATIC TELEPHONE SYSTEM.

APPLICATION FILED NOV. 25.19M-v MT/VEISSZZS TCVPS. agar/mm 1x5 COLUMIIIAl LANoqnAPH cm, ultimatum n. c.

G. A. YANOCHOWSKI AND H. E. HERSHEY.

SEMI-AUTOMATIC TELEPHONE svsnm.

APPLICATION FILED NOV. 25. I914.

1,3 1 7, 1 90. Patented Sept. 30, 1919.

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UNITED STATES PATENT OFFICE.

GEORGE A. YANOCHOWSKI, OF CHICAGO, ILLINOIS, AND HARRY E. HERSHEY, OFWHITEWATEB, KANSAS, ASSIGNORS T0 AUTOMATIC ELECTRIC COMPANY, OF CHICAGO,ILLINOIS, A CORPORATION OF ILLINOIS.

SEMI-AUTOMATIC TELEPHONE SYSTEM.

Specification of Letters Patent.

Patented Sept. 30, 1919.

Application filed November 25, 1914. Serial No. 874,054.

To all whom it may concern:

Be it known that we, GEORGE A. YANocnowsm and HARRY E. HERSHEY, bothciti- Zens of the United States of America, and residents of Chicago,Cook county, Illinois, and Whitewater, Butler county, Kansas,respectively, have invented certain new and useful Improvements inSemi-Automatic Telephone Systems, of which the following is aspecification.

Our invention relates to telephone systerns and is particularlyapplicable to manual telephone systems. Among the objects of ourinvention are the following:

To provide means whereby when a subscriber removes his receiver heimmediately supplies a guarding potential to the multiple jacks of hisline; to provide means for automatically giving a calling subscriber asignal as soon as the operator disconnects from his line to indicate tohim that he should hang up his receiver; to provide means whereby a Boperator can automatically give an A operator 9. disconnect signal bymerely dropping the calling plug; to provide means for automaticallgiving one operator a disconnect signs from another operators positionby automatically varying the resistance of the talking circuit betweenthe two cords; and to provide other details and features of improvementand combination tending to increase the efliciency and serviceability ofa telephone system. Means for accomplishing the foregoing and otheruseful ends are hereinafter set forth and claimed.

In the aocompanyin drawings Figures 1 and 2 show a complete connectionin a manual telephone system embodying the principles of our invention.

Fig. 1 shows the manual substation T, an answering jack equipment J,multiple jacks M and an operators cord circuit S.

Fig. 2 shows a manual substation T,

answering jack equipment J multiple jacks M and a B-operators cordcircuit I.

The manual substation T is an ordinary common battery manual telephonecomprising the usual receiver 2, transmitter 3, ringer 4 and condenser5. The substation T is similar to the substation T.

The answering jack equipment J consists of the usual line relay 6,cut-off relay 7, line lamps 8 and an answering jack 9. And in additionthere is provided the slow acting relay 10. The answering jack equipmentJ is similar to that shown at J except that the relays 6 and 10 arereplaced by the one double wound relay 11". The relay 11 is soconstructed and adjusted that when a circuit is closed through its lefthand winding and not through its right hand winding the armature 93alone Wlll be attracted.

The A operators cord circuit S is a well known type of cord circuitcomprising the usual answering and calling plugs P and P, respectively,inductively connected togethcr through the medium of a re )eating coilR. The usual supervisory relays 11 and 12 are included in the sides ofthe cord circuit for controlling the supervisory lamps 13 and 14.

The B- 1perators cord circuit I comprises the plug the supervisory lamp15 and relays for controlling the same. At 16 is shown a plug seatswitch whose springs are separated when the plug P is in its seat.

For the purpose of supplying battery current for operating the apparatusand for talking purposes, there is shown the battery B, having oneterminal grounded at G. The busy signaling machines Q and Q asrepresented herein, comprise an induction coil or transformer, theprimary winding of which is included in a local circuit with a batteryand an interrupter. Through the medium of this interrupter aninterrupted current is supplied to the primary winding, which induces analternating curent in the secondary winding, whereby when said windingis connected with the subscribers line, a buzzing sound is heard in thereceiver.

A general description of the apparatus having been given, it will now beexplained how connection can be established between the line ofsubstation T and the line of a called substation T.

Upon the removal of the receiver at the calling substation a circuit maybe traced from ground G through sprin 17 and 18, to and throughsubstation springs 19 and 20 and the relay 6 to battery B. The relay 6,upon energizing, places ground energizin from G upon the bush of all themultiple jacks associated with the line of substation T, and in additioncloses a circuit from ground G, through springs 21 and 22, lamp 8,springs 23 and 24 to battery B.

The operator upon seeing the lamp 8 glowing, knows that a connection isdesired and thereupon inserts the plug P into the jack 9. A circuit maynow be traced from ground G through relay 25, sleeve of plug P and bushof jack 9, relay 7, relay 10 to battery B. The relays 25, 7 and 10energize over the above circuit, the relay 7, upon energizing, removesthe line relay 6 from the line and extends the connection to the cordcircuit S. The relay 10, upon energizing, removes ground G from thecircuit of lamp 8. The relay 25, upon energizing, closes the circuit oflamp 18 at the springs 25, but this is without effect as the saidcircuit is opened at the springs 27, as will be hereinafter explained.Upon the energization of relay! a circuit may be traced from ground (lthrough winding 28 of repeating coil R tip of plug P and of jack 9,springs 19 to and through substation T, springs 18 and 18*, ring of jack9 and of plug P, relay 11, winding 29 of repeating coil R to battery B.The relay 11,- upon energizing, opens the circuit of the lamp 13 at thesprings 27. The A-operator now depresses the key K, thereby cutting hertalking set across the calling line, and converses with the callingsubscriber. Upon learning the number of the called subscriber theA-operator depresses the order wire key K and repeats the number to theB-operator the B-cperator then assigns the trunk to be used.

The B-operator upon receiving an order, raises the plug P associatedwith the trunk she has assigned to the A-operator, from its plug switchseat 16 and touches the bush of the jack of the called line with the tipof the said plug. ff theline is idle, the B-operator then inserts theplug P into the jack M and in so doin closes a circuit from ground Gthrou h re ay 30, sleeve of plug P and bush of jac M, springs 31, thetwo windings of relay 11 in series to battery B. The relay 11, upon enerizing, removes the line relay 3% from the ca led hne. The relay 30, uponcompletes the talking circuit through t e cord circuit I. Upon theremoval of the plug P from the plug seat switch 16, a circuit may betraced from ound (l through springs 16, relay 35 to flattery B. Therelay 35, upon energizing, closes a circuit through the lamp 15 which iswitho. t effect at this time, since the said lamp will immediately beextinguished as hereinafter explained.

The A-operator, upon being assigned a trunk, inserts the plug P into thejack 33, associated with the assigned trunk. A circuit may now be tracedfrom ground G through resistance 36, bush of jack 33 and sleeve of plug1, relay 37 to battery B. The relay 37, upon energizing, closes acircuit from ground G through springs 38, lamp 14, spring 39 to batteryB. The glowing of lamp ll informs the A-opcrator that the called partyhas not answered. As a further result of the insertion of the plug 1into the jack 33, another circuit may be traced from ground G throughwinding 8% of repeating coil ll, lip of plug P and of jack 33 conductor90, resistance 40, relay 41, conductor 91, ring of jack 33 and of pin P,relay 12, winding 42 of repeating coil to battery B. The resistance 40is high enough that relay 12 will not operatively energize over theabove circuit, the relay 41, however, energizes and opens the circuit ofthe lamp 15 at the springs 43.

Returning to the operation of the B-oporator-s coral circuit Fig. 2 itwill be seen llmt upon l'hc i-n rgizution oi the relay 3f :1 rircuil isr-lrmal from ground 1}" through interrupter ll springs 15, springs -16,and ringer relay l; to battery I The ringer lUi2L 17 energizesintermittently due to the interrupter 44: and operates to disconnect thecalled line from the cord circuit and bridge the ringing currentgenerator R in series with battery B across the called line. he circuitmay be traced from ground G through springs 48 and d8, springs 49 and50, ti of plug P and of jack M, springs 51 and 52 through ringer andcondenser at substation T springs 53 and 5 1 ring of jack M and of plugP sirings 55 and 56, upper winding of relay 5 generator R, and throughbattery B to round G. The ringer at substation T will be energized bythe ringing current, but the relay 57 is so adjusted that it will notrespond to the said ringing current. Upon the response of the calledsubscriber a path for direct current Will be formed at the substation Twhereu on the relay 57 will become energized. Tile relay 57, uponenergizing, opens the circuit of the ringer relay at the springs 45, inaddition forms a locking circuit for itself from ground Gr through thelower winding of relay 57, springs 58, springs 59 to battery B.

Upon the deenergization of ringer relay 47 battery and ground aresupplied to the called line through, the relays 60 and 61. The relay 60,upon energizing, shunts the resistance 40 at the springs 62, thisincreases the flow of current in the trunk to such an extent that therelay 12 becomes energized and opens the circuit of the lamp 14:. Theextinguishing of the lamp 14 notifies the A operator that the calledsubscriber has an swered.

Upon the completion of the conversation the restoring of the receiver atthe calling substation opens the circuit of the relay 11. The relay 11,upon denergizing, closes a circuit from ground Gr through springs 27,springs 25" and lamp; 13 to battery B. T'hus causing saidlalnp 13 toglow. The restoring of the receiver at the called substation opens thecircuit of the relay 60, which, upon denergizing, removes the shunt fromaround the resistance 40. This added resistance. in the trunk cansestherelay l2 torelease its armature thus again closing the circuit of thelamp 14. The A-olperator, upon seeing both the lamp 13 and t e lamp 14lighted knows that a disconnect is desired and forthwithremoves theplugs P and ,P' from their respective jacks. The removal of the, p11] P'a from the jack 33 opens the circuit of relay &1, which, upondeenergizing, closes a circuit from ground (l through springs 43,1amp15, springs 59 to battery B. The glowing of the lamp 15 informs theB-operator that the A-operator has taken down the connection, whereuponthe B operator removes the plug P from the jack M. The restoring of theplug P to the plug seat switch 16 opens the circuit of the relay 35. Therelay 35 upon deenergizing opens the circuit to the lower winding ofrelay 57.

It having been ex lained how a connection can be establis ed between acalling and a called subscriber and how the same is released, it willnow be explained how a connection is prevented from being made with abusy line and how the connection is then taken down and the callingsubscriber given the busy signal from his answering jack equipment. Ifthe called line should be busy, there will be a ground potential uponthe bush of all the multiple jacks associated with that line. When theB-operator touches the tip of the plug P to the bush of a busy multiplejack, a circuit will be formed from ground potential at the multiplejack through tip of lug P springs 50 and 63 and tertiary win ing 64 ofinduction coil to battery B. This flow of current will cause a click inthe B-operators receiver which will inform her that the called number isbusy whereupon she returns the plug P to its p u seat switch 16, thusopenin the circuit 0 the relay 35. The relay 3 upon deenergizing, closesa circuit from ground G through interrupter 65, springs 66, springs 67,relay 68 to battery B. The relay 68 energizes intermittently, due to theinterrupter 65 and operates to periodically shunt the resistance '40 atthe springs 69. This shunting of the resistance 40 causes the lamp 14 tobe intermittently extinguished thus informing the A-operator that thecalled number is busy. The A-operator then removes the lugs P and P fromtheir respective jac s. The removal of the lug P from the jack 9 opensthe circuit of the cut-off relay 7, which, upon deenergizing, closes acircuit from ground G, through springs 17 and 18, to and throughsubstation T, springs 19 and 20 and relay 6 to battery B. The relay 6,upon energizing, closes a circuit from ground Gr through springs and 71,springs 72, relay 10 to battery B. The relay 10, being slow acting, didnot deenergize immediately upon the withdrawal of the plug P, butremained energized long enough for the above traced circuit to beformed, after which it of course locks up. Another circuit is now formedfrom ground G through interrupter 73, secondary of busy machine Q,springs 74, springs to and through the substation T, springs 18 and 17to ound G. The calling subscriber upon hearlng the busy tone will knowthat the called number is busy and will then return his receiver to thereceiver hook, thereby causing the deenergization of line relay 6, whichin turn allows the relay 10 to deenergize. It will be seen that as lonas the calling subscriber is receiving the usy tone there will be aguarding potential from ground G upon all of the multiple jacksassociated with that line.

It will be seen therefore that we have provided an improved arrangementwhereby assoon as a subscribers line relay energizes a guardingpotential is a plied to the multiple jacks M so as to ma re the callingline busy even before the operator answers. We have also rovided animproved arrangement where y the line relay of the subscriber controlsthe signal for the operator and also controls a signal for thesubscriber to indicate to him that he should hang up his receiver andcall again. We also provide means whereby the B operator through themedium of a plug seat comprising the plug 16 is enabled to give the Aoperator automatically a busy flash signal by varying the resistance onthe line between the two cords. The means for accomplishing thiscomprises, of course, the relay 68 and the interrupting machine 65.

Therefore it will be seen that we have provided an improved system inwhich the efficiency of the equipment is increased by simplifying thematter of signaling.

What we claim as our invention is:

1. In a telephone system, an A trunk, a relay 1n said trunk and a signalcontrolled thereby, a B trunk terminating in a plug, means forconnecting said A and B trunks to extend the conductors of a talkingcircuit to said plug, a circuit controlled by said plug, means forautomatically varying the resistance of the said talking circuitcomprisin a magnet, said magnet located in the said plug controlledcircuit, means for energ1z1ng sald magnet when the plug is raised toprevent the variation of sald resistance, and means for breaking thecircuit of said last magnet when the plug is replaced for deenergizingsaid magnet whereby the said resistanee may be varied, said relay resonsive t0 said vat'iatian in the talking circuit to 0perate the signal.

2. In a telephone System, an A word, a talking circuit connecting thetwo, a signal at the A cord, a pm seat switch at the E 00rd, meanscr'mtrolle by the A operator for 0' etatin said signal, 1005115contt'dlletl b t ie can subscriber for retiring said sigma? and meansfor intermittently oFeiating sal signal, said last means contrbl ed bythe B operators lu seat switch.

3. In a tele hone system, an A curd, a talking circuit connecting thewe, a S'ghal at the A cord, a plug seat switch at the B cord, me'afisco'ntrolle by the A opetiiitor for oerati said si nal, means contra ledin t e calle' Subscribe:- for retiring said sigma and means for varyingthe resistance of said talking circuit to intermittentl operate saidsignal, said last means eontro' led by the B operaters plug seat switch.

4. In a, telephone system, an A cord, a B cord, a talking circuitconnecting the two, a signal at the A cord, a plug seat switch at the B66%; meme eontrofied by the A opeiator for fi eming said signal,electremeghetic means ebntrolled b the called su scribe? fer retiringsaid 5 Fuel, and eleatromfignetif: means fol iii'tef'm ttently operatingaid signal, sei lest meaiis wntrolled by the B operators p ug seatswitch.

5. In a il lephdile s'yetem, A eord, a B eerd, a talking eit'euiteonneeting the two, a signal at the A cord, a plug s'eilt switch at theB eord, meene controlled by the A opetatdi for epeiating setid signal,eleemma netid means cont-rulled b" the called eu scriber for retiiiil,ewid eigimh and electromagnetic eafis 0r vsfi'j'iiig the resistance ofsaid m1 'ng' circuit t6 iiitefiiiittently opei-ate seici signal Quidlast means eentrolled by the B o emtors p11iitt switch.

Signed y Us at Oh cage, Cook county, Illinois, this 11th day (ifNovember, 1914.

GEORGE A. YANOCHOWSKI. HARRY E. HERSHEY. Witnesses:

HERBERT Kimcim,

M. AREA;

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